Dayton AudioPSS555-8
£194.48 · 57% less, betterFs28 Hz +5%
Qts0.33 +18%, worse
Vas444 L +148%, worse
BL29.7 T·m −22%, worse
Xmax11 mm −48%, worse
Sensitivity96.4 dB +3.9, better
21-inch LF driver · 2,000 W
Dayton Audio HTS545HE-4 4Ω
4 Ω · 18–500 Hz
£448.82
SteadyParts Express · 23 in stock · Ships from United States · All 2 offers
- Fs
- 26Hz
- Xmax
- 21mm
- SPL
- 93dB
- Pe
- 2000W
- BL
- 38.2T·m
- Vd
- 3221cm³
- Qts
- 0.28
- Vas
- 179L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 1 trace
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
on-axis
Frequency response
240 plotted pointsMedium confidence4,614 selected pixels of 4,614
Dayton Audio HTS545HE-4 is a 21-inch 4 ohm LF driver rated at 2000 W RMS. The validated T/S data includes Fs 26 Hz, Qts 0.28, Vas 179 L, Xmax 21 mm, sensitivity 92.5 dB, plus 3221 cm³ Vd and 91 EBP. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £448.82.
The published T/S values agree with each other
Thiele/Small
- Fs
- 26Hz
- Qts
- 0.28
- Qes
- 0.29
- Qms
- 7.9
- Vas
- 179L
- Re
- 3.8Ω
- Le
- 8.50mH
Motor and cone
- BL
- 38.2T·m
- Sd
- 1534cm²
- Mms
- 676g
- Xmax
- 21mm
- Vd †
- 3221cm³
Power and response
- Sensitivity †
- 92.5dB
- Manufacturer sensitivity
- 95.6dB
- Power
- 2000W
- Impedance
- 4Ω
- Range
- 18–500Hz
- EBP †
- 91 · Sealed or vented
Size and mounting
- Diameter
- 544.8mm
- Cutout
- 495.3mm
- Depth
- 258.6mm
Other published values
- Cms
- 0.05mm/N
- Power Peak
- 4000
Sensitivity shows 92.5 dB, calculated from the T/S values. Dayton Audio publishes 95.6 dB, 3.1 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Dayton Audio lists
LF · Primary · 21″
- BL
- 38.2T·m
- Fs
- 26Hz
- Le
- 8.50mH
- Re
- 3.8Ω
- Sd
- 1534cm²
- Cms
- 0.05mm/N
- Mms
- 676g
- Qes
- 0.29
- Qms
- 7.9
- Qts
- 0.28
- SPL
- 92.5dB
- Vas
- 179L
- Xmax
- 21mm
- Power
- 2000W
- Impedance
- 4Ω
- Power Peak
- 4000
- Sensitivity
- 95.6dB
- Low limit
- 18Hz
- Calculated sensitivity †
- 92.5dB
- High limit
- 500Hz
- Manufacturer sensitivity
- 95.6dB
- Diameter
- 544.8mm
- Depth
- 258.6mm
- Cutout
- 495.3mm
02
Compare
Same-size drivers, compared with the HTS545HE-4. Clear differences are green when better and red when worse.
This driverHTS545HE-4
Best price
£448.82
Fs
26 Hz
Qts
0.28
Vas
179 L
BL
38.2 T·m
Xmax
21 mm
Sensitivity
92.5 dB
Power
2000 W
SB AudienceNERO-21SW1100D
£343.60 · 23% less, betterFs32 Hz +22%, worse
Qts0.34 +21%, worse
Vas312.6 L +75%, worse
BL30 T·m −21%, worse
Xmax12.2 mm −42%, worse
Sensitivity96.7 dB +4.2, better
CelestionTSQ2145
£445.00 · Same priceFs30 Hz +14%, worse
Qts0.34 +23%, worse
Vas253.8 L +42%, worse
BL33.8 T·m −12%, worse
Xmax15 mm −29%, worse
Sensitivity94.8 dB +2.3, better
Beyma21LEX1600ND
£475.00 · 6% more, worseFs30 Hz +14%, worse
Qts0.29 +4%
Vas305 L +70%, worse
BL36.6 T·m −4%
Xmax14 mm −33%, worse
Sensitivity96.4 dB +3.9, better
RCFLF21N451
£475.00 · 6% more, worseFs30 Hz +14%, worse
Qts0.26 −7%
Vas375 L +109%, worse
BL34.5 T·m −10%
Xmax13 mm −38%, worse
Sensitivity97.8 dB +5.3, better
B&C21DS115
£484.80 · 8% more, worseFs32 Hz +22%, worse
Qts0.21 −25%, better
Vas219 L +22%, worse
BL28.6 T·m −25%, worse
Xmax15 mm −29%, worse
Sensitivity97.2 dB +4.7, better
Beyma21QLEX1600FE
£493.97 · 10% more, worseFs30 Hz +14%, worse
Qts0.28 –
Vas309 L +73%, worse
BL36.4 T·m −5%
Xmax13 mm −38%, worse
Sensitivity96.5 dB +4, better
Eighteen Sound21NLW4100
£506.41 · 13% more, worseFs34 Hz +29%, worse
Qts0.40 +43%, worse
Vas219 L +22%, worse
BL22.8 T·m −40%, worse
Xmax15.2 mm −28%, worse
Sensitivity95.1 dB +2.6, better
Eighteen Sound21LW1400
£543.74 · 21% more, worseFs28 Hz +6%
Qts0.24 −14%, better
Vas385 L +115%, worse
BL33.5 T·m −12%, worse
Xmax9.5 mm −55%, worse
Sensitivity97.5 dB +5, better
No photo
Precision DevicesPD.2155-1N
£555.00 · 24% more, worseFs33 Hz +25%, worse
Qts0.36 +29%, worse
Vas241 L +35%, worse
BL30 T·m −21%, worse
Xmax14 mm −33%, worse
Sensitivity95.7 dB +3.2, better
B&C21SW152
£585.00 · 30% more, worseFs32 Hz +22%, worse
Qts0.30 +7%
Vas200 L +12%, worse
BL32.5 T·m −15%, worse
Xmax15 mm −29%, worse
Sensitivity95.3 dB +2.8, better
Eighteen Sound21NLW9001
£587.88 · 31% more, worseFs31 Hz +18%, worse
Qts0.34 +21%, worse
Vas272 L +52%, worse
BL23.8 T·m −38%, worse
Xmax14 mm −33%, worse
Sensitivity95.4 dB +2.9, better
Eighteen Sound21NLW9601
£593.90 · 32% more, worseFs41 Hz +56%, worse
Qts0.32 +14%, worse
Vas123 L −31%, better
BL32.7 T·m −14%, worse
Xmax14 mm −33%, worse
Sensitivity96.1 dB +3.6, better
Eighteen Sound21NTLW5000
£595.00 · 33% more, worseFs30 Hz +14%, worse
Qts0.32 +14%, worse
Vas300 L +68%, worse
BL25 T·m −35%, worse
Xmax17.5 mm −17%, worse
Sensitivity95.9 dB +3.4, better
No photo
Precision DevicesPD.2160-1N
£799.00 · 78% more, worseFs35 Hz +33%, worse
Qts0.30 +7%
Vas177 L –
BL43 T·m +13%, better
Xmax16 mm −24%, worse
Sensitivity95.9 dB +3.4, better
B&C21IPAL
£863.28 · 92% more, worseFs37 Hz +41%, worse
Qts0.21 −25%, better
Vas155 L −13%, better
BL19.1 T·m −50%, worse
Xmax22 mm +5%
Sensitivity97.6 dB +5.1, better
FaitalPRO21XL3000
£878.34 · 96% more, worseFs32 Hz +22%, worse
Qts0.22 −21%, better
Vas223.5 L +25%, worse
BL35.5 T·m −7%
Xmax17.7 mm −16%, worse
Sensitivity97.3 dB +4.8, better
EminenceNSW6021-124
£916.36 · 104% more, worseFs31 Hz +17%, worse
Qts0.32 +14%, worse
Vas224.6 L +25%, worse
BL30.5 T·m −20%, worse
Xmax21 mm –
Sensitivity95 dB +2.5, better
Dayton AudioPSS545HE-4
No current priceFs29 Hz +10%
Qts0.27 −4%
Vas212.2 L +19%, worse
BL35.5 T·m −7%
Xmax21 mm –
Sensitivity94.6 dB +2.1, better
Eighteen Sound21NLW9601C
No current priceFs38 Hz +44%, worse
Qts0.29 +4%
Vas140 L −22%, better
BL33.2 T·m −13%, worse
Xmax14 mm −33%, worse
Sensitivity96 dB +3.5, better
Sica21 S 4 PL
No current priceFs35 Hz +32%, worse
Qts0.30 +7%
Vas255 L +42%, worse
BL36.1 T·m −5%
Xmax5.2 mm −75%, worse
Sensitivity97.4 dB +4.9, better
B&C21SW150
No current priceFs29 Hz +10%, worse
Qts0.26 −7%
Vas254 L +42%, worse
BL32.6 T·m −15%, worse
Xmax15 mm −29%, worse
Sensitivity95.6 dB +3.1, better
Eighteen Sound21LW2600
No current priceFs27 Hz –
Qts0.29 +4%
Vas332 L +85%, worse
BL24.9 T·m −35%, worse
Xmax14.6 mm −30%, worse
Sensitivity95.6 dB +3.1, better
CelestionNTR21-5010JD
No current priceFs32 Hz +22%, worse
Qts0.32 +14%, worse
Vas276.7 L +55%, worse
BL33.9 T·m −11%, worse
Xmax9 mm −57%, worse
Sensitivity96.4 dB +3.9, better
Eighteen Sound21NLW5300
No current priceFs31 Hz +18%, worse
Qts0.32 +14%, worse
Vas325 L +82%, worse
BL31 T·m −19%, worse
Xmax15.3 mm −27%, worse
Sensitivity96.6 dB +4.1, better
Eighteen Sound21ID
No current priceFs38 Hz +44%, worse
Qts0.23 −18%, better
Vas143 L −20%, better
BL25.2 T·m −34%, worse
Xmax14 mm −33%, worse
Sensitivity97.2 dB +4.7, better
No current price
Fs35 Hz +33%, worse
Qts0.34 +21%, worse
Vas266 L +49%, worse
BL31.3 T·m −18%, worse
Xmax14 mm −33%, worse
Sensitivity97.1 dB +4.6, better
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +33%, worse
Qts0.34 +21%, worse
Vas266 L +49%, worse
BL31.3 T·m −18%, worse
Xmax14 mm −33%, worse
Sensitivity97.1 dB +4.6, better
No current price
Fs33 Hz +25%, worse
Qts0.36 +29%, worse
Vas241 L +35%, worse
BL30 T·m −21%, worse
Xmax14 mm −33%, worse
Sensitivity95.7 dB +3.2, better
Eighteen Sound21LW2500
No current priceFs29 Hz +10%, worse
Qts0.37 +32%, worse
Vas305 L +70%, worse
BL30 T·m −21%, worse
Xmax14 mm −33%, worse
Sensitivity94.9 dB +2.4, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express4.8 out of 514 ratings · Checked 26 Oct 2026Read reviews on Parts Express
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Parts Express Import VAT and duty may apply | £448.82, the lowest price | 23 in stock | Visit shop at Parts Express | |
Audiophonics Import VAT and duty may apply | £879.18 | 96% above the lowest price | Available on order | Visit shop at Audiophonics |
Best price over time
Tracked since 22 Jul